A Primary Magnetostratigraphy Study on Kuche and Xiyu Formations on the Edge of Tarim Basin

Deng Xiuqin; Yue Leping; Teng Zhihong; Bian Xiaowei

The paper studied the ages of Kuche and Xiyu Formations on the edge of Tarim Basin by The means of magnetostratigraphy , and discussed the epoch when the mountains around and Qinghai- Tibet rapidly lifted. The results showed that Gilbert reversal polarity zone was recorded in the Kuche Formation (about 3.40～5.30 Ma), including Cochiti (3.80～3.90 Ma), Nunivak (4.05～4.20 Ma) , Sidufjall(4.32～4.47 Ma) and Thvera (4.85～5.00 Ma) normal polarity subzones. Gauss polarity zone(2.48～3.40 Ma), occurred within the lower Xiyu Formation, including Kaena(2.92～3.01 Ma) and Mammo the(3.05～3.15 Ma) reversal polarity subzones. While the upper Xiyu formation, which recorded the Reunion normal polarity subzone (2.12～2.14 Ma) and Olduvai normal polarity subzone (1.67～1.87 Ma), was deposited during the early Matuyama reversal polarity time about (1.50～2.48 Ma). The Kuche Formation, as a result, was formed during Early Pliocene(N¹ ₂ k), 3.40～5.30 MaBP) The lower Xiyu formation was taken shape during Late Pliocene (N² ₂ x , 2.48～3.40MaBP and the upper Xiyu Formation during Early Plioctocene(Q¹ ₁), (1.50～2.48 MaBP). Interms of data above, it was deduced that the epoch, when the speedily lifting of Qinghai-Tibet and the Ginantic mountains on the edge of the Tarim basin occured, was at the early stage of Ea rlyPliocene, about 5.30 Ma.

A Primary Magnetostratigraphy Study on Kuche and Xiyu Formations on the Edge of Tarim Basin

Geology Department of the Northwest University, Xi'an 710069

Received Date: 1996-02-29

Rev Recd Date: 1997-03-18

Publish Date: 1998-06-10

Key words:

Abstract: The paper studied the ages of Kuche and Xiyu Formations on the edge of Tarim Basin by The means of magnetostratigraphy , and discussed the epoch when the mountains around and Qinghai- Tibet rapidly lifted. The results showed that Gilbert reversal polarity zone was recorded in the Kuche Formation (about 3.40～5.30 Ma), including Cochiti (3.80～3.90 Ma), Nunivak (4.05～4.20 Ma) , Sidufjall(4.32～4.47 Ma) and Thvera (4.85～5.00 Ma) normal polarity subzones. Gauss polarity zone(2.48～3.40 Ma), occurred within the lower Xiyu Formation, including Kaena(2.92～3.01 Ma) and Mammo the(3.05～3.15 Ma) reversal polarity subzones. While the upper Xiyu formation, which recorded the Reunion normal polarity subzone (2.12～2.14 Ma) and Olduvai normal polarity subzone (1.67～1.87 Ma), was deposited during the early Matuyama reversal polarity time about (1.50～2.48 Ma). The Kuche Formation, as a result, was formed during Early Pliocene(N¹ ₂ k), 3.40～5.30 MaBP) The lower Xiyu formation was taken shape during Late Pliocene (N² ₂ x , 2.48～3.40MaBP and the upper Xiyu Formation during Early Plioctocene(Q¹ ₁), (1.50～2.48 MaBP). Interms of data above, it was deduced that the epoch, when the speedily lifting of Qinghai-Tibet and the Ginantic mountains on the edge of the Tarim basin occured, was at the early stage of Ea rlyPliocene, about 5.30 Ma.

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Reference (10)

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A Primary Magnetostratigraphy Study on Kuche and Xiyu Formations on the Edge of Tarim Basin

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